Signs and Symptoms - Misalignment of neighboring teeth and overcrowding - Malocclusion resulting in severe jaw joint pain - Cavities development due to irregular tooth shape - Significant self-esteem and confidence issues related to physical appearance

Causes - Associated with genetic syndromes such as otodental syndrome, insulin-resistant diabetes, facial hemihyperplasia, KGB syndrome, and 47 XYY syndrome - Genetic mutations regulating tooth growth can cause abnormal growth - Hormonal imbalances, likely related to the pituitary gland, can result in deviant tooth growth - Factors during early childhood, such as diet and exposure to toxins or radiation, can increase the likelihood of macrodontia

Pathophysiology - Gigantism, caused by excessive growth hormone secretion, can lead to macrodontia - Growth hormone stimulates the synthesis of insulin-like growth factor 1 (IGF-1) which controls body growth - Mutant form of the Gs protein in growth hormone-secreting adenomas results in overexpression of growth hormone and overgrowth of teeth - KBG syndrome, caused by a mutation in the ANKRD11 gene, leads to macrodontia due to abnormal regulation of dental development

Diagnosis - Diagnosis is obtained through observation, measurement, and comparison with standard tooth size - Radiological investigation, such as X-rays, can indicate macrodontia of erupted and unerupted teeth - Level 1 radiographic examination should consider medical records, clinical signs, and risk/benefits of radiation exposure - Orthopantomography and intraoral radiography may be recommended as imaging techniques - CBCT (3D imaging) is used when two-dimensional imaging is insufficient

Types of Macrodontia - True generalised macrodontia is when all teeth grow larger than normal, often associated with pituitary gigantism - Localised macrodontia affects specific teeth or tooth groups - Fusion macrodontia occurs when two teeth fuse together, resulting in an enlarged tooth - Gemination macrodontia is when a single tooth appears as two separate teeth due to incomplete tooth division - Dilaceration macrodontia is characterised by abnormal tooth curvature or angulation

Treatment: - Diagnosis by a dental specialist - Recommendation to visit a cosmetic dentist - Three main procedures for improving the look of affected teeth: orthodontics, teeth shaving, and teeth removal - Orthodontics can straighten teeth and expand the jaw if necessary - Braces and a retainer can help minimize misalignment caused by macrodontia

Prognosis: - Macrodontia does not affect life expectancy or likelihood of remission - Implications include misalignment, jaw pain, and crowding issues - Complications of untreated macrodontia include bite alignment issues and dental caries - Overgrown teeth can have lasting impacts on bite mechanics - Dental caries can lead to tooth degradation and infections

Epidemiology: - Macrodontia affects 0.03% of the population - Higher prevalence in males (1.2%) compared to females (0.9%) - Disruptions of regular tooth growth usually occur around ages 11-12

Research Direction: - Lack of understanding regarding pathophysiological mechanisms of macrodontia - Imaging techniques used for diagnosis - Treatment options concentrated in cosmetic dentistry - Correlation between genetic mutations and macrodontia - No current clinical trials for treatment